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以‘黑比诺’葡萄试管苗为试材,研究了1000μmol/mol CO_2浓度下3种不同外源蔗糖、果糖、葡萄糖对葡萄试管苗生长和光合特性的影响。结果表明:高CO_2浓度下葡萄糖处理显著提高试管苗出愈率、根和茎生长速度。与其他两类糖处理相比,出愈率分别平均提高5.8%、8.6%,根生长速度分别平均提高0.54 cm、1.02 cm,茎生长速度分别平均提高0.93 cm、1.59 cm,葡萄糖处理可以明显促进植株的生长与光合作用;高CO_2浓度导致果糖处理叶绿素相对含量较正常浓度升高。 相似文献
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Rhizama Chuanxiong is a kind of traditional medicinal herb used to promote blood circulation and eliminate wind to relieve pain. In this work, nano Rhizoma Chuanxiong particles were successfully prepared by high speed centrifugal sheering (HSCS) pulverizer. The influence of processing parameters on the size ofRhizama Chuanxiong particles and the different properties between nano Rhizoma Chuanxiong particles and original fine powder were systematically studied by ZetaPALS light scattering granulometric analyzer and optical microscope. The content of effective ingredient tetramethylpyrazine (TMP) was determined by high-performance liquid chromatography (HPLC). The results illustrate that general Rhizama Chuanxiong powder can be ultrafinely ground to nanometer within 50 min, and the cellular tissues ofRhizoma Chuanxiong are broken into pieces and dispersed stably and homogeneously after being ultrafinely ground. In addition, the active ingredients can dissolve out directly and fully, and the extraction ratio of TMP is increased 32.2% by HSCS processing. 相似文献
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中国政府和企业从对苏丹的投资中获益匪浅,譬如苏丹石油开发项目。在苏丹,无论是能力、经验、信誉还是技术优势等,我国投资者都具备较强的竞争优势。随着苏丹逐步成为众多国家投资的焦点,我国仍将抓住机遇,保持现有的投资优势,改善投资劣势,进而继续扩大对苏丹的投资规模和拓宽投资领域。11月2日,本刊记者专访苏丹矿产部部长卡迈勒·阿卜杜拉提夫,对苏丹当前的矿业合作机会、矿产勘查开发政策等有了更为深入的了解。 相似文献
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基于9根聚乙烯纤维增强超高延性水泥基复合材料(PE-ECC)和3根无纤维基体浇筑的V型缺口梁受剪性能试验,研究不同配合比和纤维体积掺量对V型缺口PE-ECC梁的剪切性能的影响。结果表明:对照组无纤维基体V型缺口梁表现为明显的脆性破坏特征,而V型缺口PE-ECC梁均发生延性破坏;V型缺口PE-ECC梁试验过程中裂缝主要出现在缺口两侧加载点与支座之间的区域,呈现明显的多缝开裂现象,当荷载达到峰值荷载之后试件的下支座处出现主裂缝并且试件具有明显的挠度,这与无纤维基体试件有着显著的区别;当纤维体积掺量在0%~2%范围内时,V型缺口PE-ECC梁的受剪承载力和延性随纤维体积掺量的增大而增加,且纤维体积掺量为2%的试件的裂缝开展较纤维体积掺量为1%的试件更加充分;当纤维体积掺量为2%时,PE-ECC梁的名义抗剪强度平均值为9.46MPa,为同配合比PE-ECC轴心抗拉强度的1.79倍。 相似文献
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